Advantages: fast forming speed, high output, and does not damage the coating, can be made into a variety of cross-sectional forms to meet the needs of use conditions; cold rolling can cause large plastic deformation of steel, thereby improving the yield of steel point. Hot-rolled seamless pipes are relative to cold-rolled seamless pipes. Cold-rolled seamless pipes are rolled below the recrystallization temperature; the grains of the steel are refined and the defects of the microstructure are eliminated, so that The steel structure is dense. Mainly reflected in the rolling direction, so that the steel is no longer isotropic to a certain extent.
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